EP 1013092 B1 20020529 - DIRECT-CONVERSION TUNER INTEGRATED CIRCUIT FOR DIRECT BROADCAST SATELLITE TELEVISION
Title (en)
DIRECT-CONVERSION TUNER INTEGRATED CIRCUIT FOR DIRECT BROADCAST SATELLITE TELEVISION
Title (de)
IN EINER HALBLEITERSCHALTUNG INTEGRIERTER DIREKTUMSETZTUNER FÜR DIREKTRUNDFUNK-SATELLITENFERSEHEN
Title (fr)
CIRCUIT INTEGRE DE SYNTONISATEUR A CONVERSION DIRECTE POUR TELEVISION PAR SATELLITE A DIFFUSION DIRECTE
Publication
Application
Priority
- US 9803587 W 19980224
- US 80840097 A 19970228
Abstract (en)
[origin: WO9838799A1] A converter for the direct down-conversion of direct broadcast satellite signals such as those used for digital television. The direct broadcast satellite signal received from the satellite dish is amplified and then downshifted within the Low Noise Block (LNB), a subsystem contained with the satellite dish assembly, to a predetermined frequency band, typically in the L-band in the range of 950 MHz to 2150 MHz. The signal is then sent via a coaxial cable to the set-top box unit located indoors, and there directly converted from the received frequency to baseband, in the preferred embodiment by a single integrated circuit, which may include on chip active filters for further integration and for rejection of adjacent channels and anti-aliasing of analog to digital converters. Use of a wide range variable gain amplifier, generation of closely controlled inphase and quadrature components of the down-converting mixers and offset compensation provides baseband inphase and quadrature components of sufficient quality for data recovery using conventional techniques.
IPC 1-7
IPC 8 full level
H03D 3/00 (2006.01); H03D 7/00 (2006.01); H04N 5/44 (2006.01); H04N 7/20 (2006.01); H04N 21/426 (2011.01); H04N 21/61 (2011.01); H04N 21/438 (2011.01)
CPC (source: EP KR US)
H03D 3/008 (2013.01 - EP US); H04N 7/20 (2013.01 - EP KR US); H04N 21/426 (2013.01 - EP US); H04N 21/6143 (2013.01 - EP US); H04N 21/4382 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE DK FI FR GB IT LI NL SE
DOCDB simple family (publication)
WO 9838799 A1 19980903; CN 1264517 A 20000823; DE 69805635 D1 20020704; EP 1013092 A1 20000628; EP 1013092 B1 20020529; JP 2002512750 A 20020423; KR 20000075797 A 20001226; TW 391113 B 20000521; US 6031878 A 20000229
DOCDB simple family (application)
US 9803587 W 19980224; CN 98802951 A 19980224; DE 69805635 T 19980224; EP 98906681 A 19980224; JP 53777298 A 19980224; KR 19997007870 A 19990827; TW 86118990 A 19971216; US 80840097 A 19970228